Marker buoy



FIG. 1 is a perspective view of a marker buoy including a camouflage design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front end view thereof; and,

FIG. 7 is a rear end view thereof. 

CLAIM The ornamental design for a marker buoy, as shown and described. 